Inspection Using An Oscilloscope (Reference)

Fuel injection control signal 

PCM terminals 

• Fuel injector No.1: 2A (+)-Negative battery terminal (-)
• Fuel injector No.2: 2B (+)-Negative battery terminal (-)
• Fuel injector No.3: 2C (+)-Negative battery terminal (-)
• Fuel injector No.4: 2H (+)-Negative battery terminal (-)

Oscilloscope setting 

• 5 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 1: Fuel Injection Control Signal Pulse Pattern

  

CMP signal 

PCM terminals 

• 2N (+)-Negative battery terminal (-)

Oscilloscope setting 

• 1 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 2: CMP Signal Pulse Pattern

  

Evaporative purge control signal 

PCM terminals 

• 2S (+)-Negative battery terminal (-)

Oscilloscope setting 

• 10 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 3: Evaporative Purge Control Signal Pulse Pattern

  

Variable valve timing control signal 

PCM terminals 

• 2W (+)-Negative battery terminal (-)

Oscilloscope setting 

• 10 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 4: Variable Valve Timing Control Signal Pulse Pattern

  

A/F sensor heater control signal 

PCM terminals 

• 2X (+)-Negative battery terminal (-)

Oscilloscope setting 

• 5 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 5: A/F Sensor Heater Control Signal Pulse Pattern

  

CKP signal 

PCM terminals 

• 2Y(+)-Negative battery terminal (-)

Oscilloscope setting 

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 6: CKP Signal Pulse Pattern

  

Generator output voltage signal 

PCM terminals 

• 2AE (+)-Negative battery terminal (-)

Oscilloscope setting 

• 2 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 7: Generator Output Voltage Signal Pulse Pattern

  

Generator field coil control signal 

PCM terminals 

• 2AF (+)-Negative battery terminal (-)

Oscilloscope setting 

• 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 8: Generator Field Coil Control Signal Pulse Pattern

  

ESA control signal 

PCM terminals (except for California emission regulation applicable model) 

• Ignition coil No.1: 2AQ (+)-Negative battery terminal (-)
• Ignition coil No.2: 2AR (+)-Negative battery terminal (-)
• Ignition coil No.3: 2AU (+)-Negative battery terminal (-)
• Ignition coil No.4: 2AV (+)-Negative battery terminal (-)

Oscilloscope setting 

• 0.5 V/DIV (Y), 40 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 9: ESA Control Signal Pulse Pattern

  

Throttle control (-) signal 

PCM terminals 

• 2BE (+)-Negative battery terminal (-)

Oscilloscope setting 

• 10 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• idle (after warm up)
  Fig 10: Throttle Control (-) Signal Pulse Pattern

  

Throttle control (+) signal 

PCM terminals 

• 2BF (+)-Negative battery terminal (-)

Oscilloscope setting 

• 5 V/DIV (Y), 0.4 ms/DIV (X), DC range

Vehicle condition 

• Switch the ignition to ON.
  Fig 11: Throttle Control (+) Signal Pulse Pattern